/* * Copyright (c) 2009 Simtec Electronics * http://armlinux.simtec.co.uk/ * Ben Dooks <ben@simtec.co.uk> * * S3C24XX CPU Frequency scaling - debugfs status support * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/init.h> #include <linux/export.h> #include <linux/interrupt.h> #include <linux/ioport.h> #include <linux/cpufreq.h> #include <linux/debugfs.h> #include <linux/seq_file.h> #include <linux/err.h> #include <plat/cpu-freq-core.h> static struct dentry *dbgfs_root; static struct dentry *dbgfs_file_io; static struct dentry *dbgfs_file_info; static struct dentry *dbgfs_file_board; #define print_ns(x) ((x) / 10), ((x) % 10) static void show_max(struct seq_file *seq, struct s3c_freq *f) { seq_printf(seq, "MAX: F=%lu, H=%lu, P=%lu, A=%lu\n", f->fclk, f->hclk, f->pclk, f->armclk); } static int board_show(struct seq_file *seq, void *p) { struct s3c_cpufreq_config *cfg; struct s3c_cpufreq_board *brd; cfg = s3c_cpufreq_getconfig(); if (!cfg) { seq_printf(seq, "no configuration registered\n"); return 0; } brd = cfg->board; if (!brd) { seq_printf(seq, "no board definition set?\n"); return 0; } seq_printf(seq, "SDRAM refresh %u ns\n", brd->refresh); seq_printf(seq, "auto_io=%u\n", brd->auto_io); seq_printf(seq, "need_io=%u\n", brd->need_io); show_max(seq, &brd->max); return 0; } static int fops_board_open(struct inode *inode, struct file *file) { return single_open(file, board_show, NULL); } static const struct file_operations fops_board = { .open = fops_board_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, .owner = THIS_MODULE, }; static int info_show(struct seq_file *seq, void *p) { struct s3c_cpufreq_config *cfg; cfg = s3c_cpufreq_getconfig(); if (!cfg) { seq_printf(seq, "no configuration registered\n"); return 0; } seq_printf(seq, " FCLK %ld Hz\n", cfg->freq.fclk); seq_printf(seq, " HCLK %ld Hz (%lu.%lu ns)\n", cfg->freq.hclk, print_ns(cfg->freq.hclk_tns)); seq_printf(seq, " PCLK %ld Hz\n", cfg->freq.hclk); seq_printf(seq, "ARMCLK %ld Hz\n", cfg->freq.armclk); seq_printf(seq, "\n"); show_max(seq, &cfg->max); seq_printf(seq, "Divisors: P=%d, H=%d, A=%d, dvs=%s\n", cfg->divs.h_divisor, cfg->divs.p_divisor, cfg->divs.arm_divisor, cfg->divs.dvs ? "on" : "off"); seq_printf(seq, "\n"); seq_printf(seq, "lock_pll=%u\n", cfg->lock_pll); return 0; } static int fops_info_open(struct inode *inode, struct file *file) { return single_open(file, info_show, NULL); } static const struct file_operations fops_info = { .open = fops_info_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, .owner = THIS_MODULE, }; static int io_show(struct seq_file *seq, void *p) { void (*show_bank)(struct seq_file *, struct s3c_cpufreq_config *, union s3c_iobank *); struct s3c_cpufreq_config *cfg; struct s3c_iotimings *iot; union s3c_iobank *iob; int bank; cfg = s3c_cpufreq_getconfig(); if (!cfg) { seq_printf(seq, "no configuration registered\n"); return 0; } show_bank = cfg->info->debug_io_show; if (!show_bank) { seq_printf(seq, "no code to show bank timing\n"); return 0; } iot = s3c_cpufreq_getiotimings(); if (!iot) { seq_printf(seq, "no io timings registered\n"); return 0; } seq_printf(seq, "hclk period is %lu.%lu ns\n", print_ns(cfg->freq.hclk_tns)); for (bank = 0; bank < MAX_BANKS; bank++) { iob = &iot->bank[bank]; seq_printf(seq, "bank %d: ", bank); if (!iob->io_2410) { seq_printf(seq, "nothing set\n"); continue; } show_bank(seq, cfg, iob); } return 0; } static int fops_io_open(struct inode *inode, struct file *file) { return single_open(file, io_show, NULL); } static const struct file_operations fops_io = { .open = fops_io_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, .owner = THIS_MODULE, }; static int __init s3c_freq_debugfs_init(void) { dbgfs_root = debugfs_create_dir("s3c-cpufreq", NULL); if (IS_ERR(dbgfs_root)) { pr_err("%s: error creating debugfs root\n", __func__); return PTR_ERR(dbgfs_root); } dbgfs_file_io = debugfs_create_file("io-timing", S_IRUGO, dbgfs_root, NULL, &fops_io); dbgfs_file_info = debugfs_create_file("info", S_IRUGO, dbgfs_root, NULL, &fops_info); dbgfs_file_board = debugfs_create_file("board", S_IRUGO, dbgfs_root, NULL, &fops_board); return 0; } late_initcall(s3c_freq_debugfs_init);